Source note · SIP call forwarding and routing loops
A SIP proxy that receives a request whose Max-Forwards value is zero must not forward it and returns 483 (Too Many Hops), except that it may answer an OPTIONS request addressed to itself.
Checked 2026-09-25
- Vendor
- IETF
- Product
- SIP
- Subsystem
- proxy request validation
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3261 (June 2002)
- Checked
- 2026-09-25
Sources
- RFC 3261 — SIP: Session Initiation Protocol — IETF / RFC Editor · tier 1 standards and regulators · Section 16.3 Request Validation, item 3 (Max-Forwards check)
Cite this note
APA
WarmTransfer. (2026, September 25). SIP call forwarding and routing loops: source note sip-forwarding-loops-proxy-483-at-zero. WarmTransfer. https://warmtransfer.net/knowledge/claims/sip-forwarding-loops-proxy-483-at-zero
BibTeX
@misc{warmtransfer-claim-sip-forwarding-loops-proxy-483-at-zero,
title = {SIP call forwarding and routing loops: source note sip-forwarding-loops-proxy-483-at-zero},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/sip-forwarding-loops-proxy-483-at-zero},
note = {Source note sip-forwarding-loops-proxy-483-at-zero, checked 2026-09-25}
}